STM Investigation of Molecular Architectures of Porphyrinoids on a Ag(111) Surface

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The functionalization of surfaces on the nanoscale is one of the most fascinating and at the same time challenging topics in science. It is the key to tailoring catalysts, sensors, or devices for solar energy conversion, whose functional principle is based on the interaction of an active solid surface with another (liquid or gaseous) phase. As an example, planar transition metal complexes adsorbed on solid supports are promising candidates for novel heterogeneous catalysts. An important feature of these catalysts, compared to supported metal clusters, is the fact that the active sites, i. e. , the coordinated metal centers with their vacant axial coordination sites, are well de?ned and uniform. Metalloporphyrinoids are particularly suitable in this respect because they combine a structure forming elementathe rigid molecular frame, which often induces long range orderawith an active site, the coordinated metal ion. Its planar coordination environment leaves two axial coordination sites available for additional ligands. If adsorbed on a surface, one of these axial sites is occupied by the underlying substrate. The resulting electronic interaction with the surface can be used to tailor the electronic structure and thereby the reactivity of the metal center. The remaining site is free for the attachment of molecules (sensor functionality) and/or operates as a reaction center (single-site catalysis). Prototype examples are omnipresent in nature, where in particular metallo-tetrapyrrols play a decisive role in important biological processes, with the most prominent examples being iron porphyrins in heme, magnesium porphyrins in chlorophyll, and cobalt corrin in vitamin B12.The drawings are re-printed from RHK0s User Guide [1] Scan head touched
down on the sample holder. The drawing is reprinted from RHK0s ... resolution (U
= -38 mV, I = 1.22 nA). The unit cell and the preferential directions are drawn in.

Title

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STM Investigation of Molecular Architectures of Porphyrinoids on a Ag(111) Surface

Author

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Florian Buchner

Publisher

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Springer Science & Business Media - 2010-11-09

ISBN-13

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